Interesting appaloosa pattern, gulastral plume?

http://shoeby-stock.deviantart.com/art/Dressage-004-204837348 / http://shoeby-stock.deviantart.com/art/Dressage-005-204837425 stumbled across this while looking for an appaloosa marking reference. I originally liked it because of his neat roaning/spotting pattern and then I noticed he had a completely white tail! Now, I am aware that Lp does whiten tails to an extent but I have personally only seen near-white tails (on a dark base) with few spots and leopards only, which made it a little more interesting. Looking at his mane it seems pretty much solid with a few white hairs here and there. But after looking at his leg markings it kind of made me wonder if he was a gulastra plume since he had high whites in the back that looked sabino-esque, which might be a little far fetched but his tail is stark white. Assuming the tail head would normally be whitened by LP (kind of like this guy http://globalhorseculture.typepad.com/photos/uncategorized/2007/11/14/g… ) but even to my knowledge most Lp's usually still have tinges/traces of colour in their original tail colour unless they are on a light base coat (where it would be near impossible to differentiate the two colours). And I mean holy smokes, his tail doesn't have a speck of colour in it! looks like it was just freshly bleached XD Just kind of curious to see everyones opinions.